9507 Color Display Adjust

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9507 Color Display Parts

User-adjustable Effects 
The two effects which are easiest to identify and adjust are

•  Vertically off-center image
•  Horizontally off-center image

Other effects are more subtile. In particular, liquid-crystal displays driven by an analog source exhibit certain optical effects which may, in some applications and workplace environments, over a period of time become distracting.
They are liable to be perceived by the user as:

•  Slight tremors up or down the vertical lines of tables, boxes and text characters,  the tremors may seem to be moving or stationary.
•  A faint, linear, horizontal, background quiver in areas of solid color.
•  Slight ghost-imaging or smearing of horizontal lines.

They indicate that the optimum internal settings of the display panel installed by the factory need to be fine-tuned to the application or workplace lighting conditions.

However there are some colors which liquid-crystal displays cannot represent easily when driven by an analog source. The display creates these colors by switching alternate pels on and off, or half off. If you cannot get an acceptable rendering of a particular color, the user may have to choose another.

Non adjustable Effects 
Liquid-crystal displays are liable to experience condition refereed to as failed sub-pixels. The user becomes aware of them as dark or bright pinpoints which appear, in every application, at the same place, or places, on the screen.

You cannot adjust these pinpoints or remove them. The design specification for the IBM 9507 Color Display allows a small number of failed pixels, comprising a mix of on-pels and off-pels.

9507 Color Display Adjustment.

The Back-of Panel Controls. (Picture show factory-set positions)

Fine Tuning Procedure.

Only attempt to fine tuning when stable temperature conditions have been established for the IBM 9507 Color Display. This will generally mean that the display panel has been running for at least 20 minutes.

1.  Open the flap at the back of the display panel to reveal the fine tuning controls.
2.  Ensure that the slide-switch A is set to Position 1, and that all other  switches are also at their factory-set positions, as shown in the schematic diagram.
3.  Read the following notes before you continue.
   •  Position 0 of slide-switch A and of slide-switch D, and the recessed pushbutton A1, are  for factory use.
   •  The internal functions associated with rotary switch B are identified in 'The Back-of-Panel  Controls' described below.
   •  For each function selected with the rotary switch B pushbuttons B3 and B3  are used to effect a shift, in opposite directions, from the current internal settings. The shift in settings  affects the characters on the screen. One press causes a one-increment shift in the value of setting.
   •  The recessed pushbutton B1 is a RESET pushbutton.. When it is pressed, the settings installed  at the factory are re-installed. You may press pushbutton B1 (for example, with the tip of a pen)  at any time during fine tuning at any function selected with rotary switch B

Switch	Function
A	Position 0 - factory use only.
	Position 1 - to enable user adjustment.
A1	Factory use only
B	Select 0 to adjust the clock-to-video phase relation.
	....... 2 to adjust the horizontal image centering.
	....... 3 to adjust the vertical image centering.
	....... 4 to adjust the max. white signal level.
	Position 1 - factory use only
B1	Press to reset all of the function values to those
	installed during setup at the factory.
B2	Press to decrease the value of the function selected
	with rotary switch B.
B3	Press to increase the value of the function selected
	with rotary switch B.
C	Position 0 - used by factory for automatic installation
	of a full-screen image.
	Position 1 - to expand or compress the image.
D	Factory use only (set at position 0).

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